Experimental Investigation on Magnetically Driven Metal Liner Implosions at High Velocity

A high speed implosion experiment of magnetically driven metal liner has been conducted on the pulse power device CQ-3 at the Institute of Fluid Physics, CAEP. In the experiment, the load configuration consists of two Al(2024) liners in series on the circuit. The loading current roses along 500ns with a peak of 2.2MA. The PDV( Photonic Doppler velocimetry) probes were used to measure the velocity histories of liner's free surfaces. The experimental data show that the implosion velocity of the inner liner was up to 6.5km/s. The implosion velocity history calculated with the SSS-MHD code well agrees with the measured one. According to the calculated pressure vs. time on the inner liner's radial profile, it is indicated that the liner material Al subjected a maximum pressure about 22GPa while under ramp loading in the implosion. In view of this experiment and similar works abroad, it could be expected that the experiments of magnetically driven metal liner high velocity implosion would have important prospects applied in ultra-high pressure quasi-isentropic compression, material dynamics at high strain rates, Magneto-Inertial Fusion (MIF) research and etc..